Using benzodiacepines for a “bad trip”

Is it a good idea to stop a bad trip on mushroom or LSD with benzo’s (I have Xanax and Valium)?

If symptoms of a bad trip are mild it is possible to manage them using simply psychological measures (talking quietly to the person, remember him/her that he is under the effect of a drug, that he is not going to be crazy forever, offer some physical contact, try to alleviate hallucinations…). If symptoms are very severe (extreme anxiety, paranoid ideas, aggresivity) it is possible to use any benzo or even some neuroleptics (there are some experiences with haloperidol, olanzapine and risperidone).